Document `LinkageChecker`.
Document `LinkageChecker`.

mahori/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,mahori/brew,claui/brew,reitermarkus/brew,vitorgalvao/brew,reitermarkus/brew,EricFromCanada/brew,mahori/brew,EricFromCanada/brew,konqui/brew,reitermarkus/brew,JCount/brew,claui/brew,Homebrew/brew,nandub/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,EricFromCanada/brew,vitorgalvao/brew,sjackman/homebrew,nandub/brew,MikeMcQuaid/brew,nandub/brew,JCount/brew,sjackman/homebrew,mahori/brew,EricFromCanada/brew,sjackman/homebrew,claui/brew,vitorgalvao/brew,claui/brew,sjackman/homebrew,Homebrew/brew,konqui/brew,konqui/brew,reitermarkus/brew,vitorgalvao/brew,konqui/brew,Homebrew/brew,nandub/brew,Homebrew/brew